Cat 18M3 Motor Grader

Väghyvel 18M3

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Base Power (1st Gear) - Net 304 HP
Bore 5.1 in
Stroke 6.2 in
Base Power (1st Gear) - Net - Metric 309 HP
Derating Altitude - Tier 2/Stage II/Japan 2001 (Tier 2) Equivalent 12973 ft
Derating Altitude - Tier 3/Stage IIIA/Japan 2006 (Tier 3) Equivalent 12176 ft
Derating Altitude - Tier 4/Stage IV/Japan 2014 (Tier 4 Final) 12500 ft
Maximum Torque - ISO 9249 - Tier 2/Stage II/Japan 2001 (Tier 2) Equivalent 1270 lb/ft
Maximum Torque - ISO 9249 - Tier 3/Stage IIIA/Japan 2006 (Tier 3) Equivalent 1270 lb/ft
Maximum Torque - ISO 9249 - Tier 4/Stage IV/Japan 2014 (Tier 4 Final) 1306 lb/ft
Standard - Ambient Capability 122 °F
Displacement 763 in³
Power Train
Brakes - Dynamic Brake Torque per Wheel 27069.27 lb/ft
Hydraulic System
Maximum System Pressure 3590 psi
Standby Pressure 856 psi
Pump Output* 74 gal/min
Operating Specifications
Forward - 1st 2.8 mile/h
Forward - 2nd 3.8 mile/h
Forward - 3rd 5.5 mile/h
Forward - 4th 7.6 mile/h
Forward - 5th 11.8 mile/h
Forward - 6th 16 mile/h
Forward - 7th 22 mile/h
Forward - 8th 32.1 mile/h
Reverse - 1st 2.2 mile/h
Reverse - 2nd 4.1 mile/h
Reverse - 3rd 6 mile/h
Reverse - 4th 9.3 mile/h
Reverse - 5th 17.4 mile/h
Reverse - 6th 25.3 mile/h
Top Speed - Forward 32.1 mile/h
Top Speed - Reverse 25.3 mile/h
Turning Radius - Outside Front Tires 30.5 ft
Service Refill
Fuel Capacity 131 gal (US)
Cooling System 18.5 gal (US)
DEF Tank 4.2 gal (US)
Hydraulic System - Tank 18.5 gal (US)
Hydraulic System - Total 38.6 gal (US)
Engine Oil 9.5 gal (US)
Transmission - Differential - Final Drives 26 gal (US)
Tandem Housing - Each 34 gal (US)
Front Wheel Spindle Bearing Housing 0.24 gal (US)
Circle Drive Housing 2.6 gal (US)
Circle - Blade Beam Thickness 2 in
Circle - Diameter 71.7 in
Drawbar - Height 8 in
Drawbar - Width 3 in
Front Axle - Height to Center 26.4 in
Front Frame Structure - Height 18.1 in
Front Frame Structure - Thickness 0.6 in
Front Frame Structure - Width 14 in
Sidewall Thickness - Inner 0.9 in
Sidewall Thickness - Outer 0.9 in
Height 25.5 in
Width 9.3 in
Drive Chain Pitch 2.5 in
Wheel Axle Spacing 72.5 in
Blade Width 18 ft
Arc Radius 16.3 in
Throat Clearance 5 in
Blade Pull* - Base GVW 47216 lb
Blade Pull* - Maximum GVW 52878 lb
Cutting Edge Thickness 1.4 in
Cutting Edge Width 10 in
Down Force - Base GVW 34008 lb
Down Force - Maximum GVW 43861 lb
End Bit - Thickness 0.75 in
End Bit - Width 6 in
Height 31 in
Thickness 1 in
Width 18 ft
Blade Range
Maximum Lift Above Ground 15.7 in
Maximum Depth of Cut 18.5 in
Circle Centershift - Left 27.2 in
Circle Centershift - Right 22 in
Maximum Shoulder Reach Outside of Tires - Left 103 in
Maximum Shoulder Reach Outside of Tires - Right 103 in
Moldboard Sideshift - Left 29.1 in
Moldboard Sideshift - Right 31.1 in
Ripping Depth - Maximum 17.8 in
Shank Holder Spacing - Minimum 17.5 in
Penetration Force 30311 lb
Pry-Out Force 43700 lb
Machine Length Increase, Beam Raised 63.4 in
Shank Holder Spacing - Maximum 20 in
Operating Weight - Typically Equipped 74324 lb
Weights Tier 4 Final/Stage IV/Japan 2014 (Tier 4 Final)*
Gross Vehicle Weight - Base** - Front Axle 19837 lb
Gross Vehicle Weight - Base** - Rear Axle 52461 lb
Gross Vehicle Weight - Base** - Total 72298 lb
Gross Vehicle Weight - Maximum Tested - Front Axle 26125 lb
Gross Vehicle Weight - Maximum Tested - Rear Axle 58753 lb
Gross Vehicle Weight - Maximum Tested - Total 84877 lb
Gross Vehicle Weight - Typically Equipped - Front Axle 20494 lb
Gross Vehicle Weight - Typically Equipped - Rear Axle 53830 lb
Gross Vehicle Weight - Typically Equipped - Total 74324 lb
Dimensions (Approximate)
Ground Clearance - Rear Axle 16.7 in
Height - Exhaust Stack 141.1 in
Height - Front Axle Center 29.9 in
Height - Top of Cab 147.5 in
Height - Top of Cylinders 122.6 in
Length - Between Tandem Axles 72.5 in
Length - Counterweight to Ripper 474.4 in
Length - Front Axle to Mid Tandem 290 in
Length - Front Axle to Moldboard 120.7 in
Length - Front Tire to Rear of Machine - Including Tow Hitch 417 in
Width - Outside Front Tires 134.3 in
Width - Outside Rear Tires 134.3 in
Width - Tire Center Lines 106.4 in
Variable Power Tier 4 Final/Stage IV/Japan 2014 (Tier 4 Final), Tier 3/Stage IIIA/Japan 2006 (Tier 3) Equivalent or Tier 2/Stage II/Japan 2001 (Tier 2) Equivalent Emission Standards - Metric
Gear - Forward 1st 309 HP
Gear - Forward 2nd 309 HP
Gear - Forward 3rd 315 HP
Gear - Forward 4th 325 HP
Gear - Forward 5th 332 HP
Gear - Forward 6th 341 HP
Gear - Forward 7th 347 HP
Gear - Forward 8th 362 HP
Gear - Reverse 1st 309 HP
Gear - Reverse 2nd 309 HP
Gear - Reverse 3rd-6th 315 HP
Variable Power Tier 4 Final/Stage IV/Japan 2014 (Tier 4 Final), Tier 3/Stage IIIA/Japan 2006 (Tier 3) Equivalent or Tier 2/Stage II/Japan 2001 (Tier 2) Equivalent Emission Standards - Net
Gear - Forward 1st 304 HP
Gear - Forward 2nd 304 HP
Gear - Forward 3rd 311 HP
Gear - Forward 4th 321 HP
Gear - Forward 5th 327 HP
Gear - Forward 6th 337 HP
Gear - Forward 7th 342 HP
Gear - Forward 8th 357 HP
Gear - Reverse 1st 304 HP
Gear - Reverse 2nd 304 HP
Gear - Reverse 3rd-6th 311 HP



You measure profitability by the ore you produce – and the more cost effectively you do that, the more successful you are. While drills, draglines, loaders and haul trucks are responsible for producing ore, motor graders have a direct impact on how productively these machines can operate – in particular in their role in haul road maintenance.
  • 18 Foot Moldboard – The 18M3 includes a standard 18 foot moldboard and straight 10 inch by 1 3/8 inch cutting edge, which allows the operator to increase coverage by 12.5% compared to a 16 foot moldboard. Also the operator can us a more aggressive blade angle and still be able to deposit the windrow away from the tires to protect tire life. The use of a more aggressive blade angle results in reduced load on the machine and the ability to better maintain ground speed for enhanced performance.
  • 18M3 Power Levels and Optimized Variable Horse Power (VHP) – Compared to the 16M3, the 18M3 has on average 5% more power. The additional power combined with the 18 foot moldboard and proper weight balance provides the best combination of performance and coverage. The Optimized Variable Horse Power (VHP) is designed to provide the ideal amount of power in all gears to efficiently perform diverse motor grader applications while protecting structure and drive train components.
  • Machine Balance – With optimized combination of weight and balance the 18M3 delivers enhanced traction and the ability to keep ground speed, especially when carrying a large load on the board.
  • Simple, Operator Friendly Emissions Technology – The 18M3 is available with three variations of the C13 engine with ACERT™ Technology. One meets U.S. EPA Tier 4 Final / EU Stage IV / Japan 2014 (Tier 4 Final) emissions standards and is required for sale in higher regulated countries. The other options will be capable of meeting Tier 2 / Stage II / Japan 2001 (Tier 2) equivalent emission standards or Tier 3 / Stage IIIA / Japan 2006 (Tier 3) equivalent emission standards, depending on the emission standards of the specific country. Emissions reduction technology on the 18M3 Motor Grader is designed to be transparent, with no action required from the operator.
  • Rear Ripper / Scarifier – Made to penetrate tough material fast and rip thoroughly for easier movement with the moldboard. The 18M3 includes a standard ripper with three shanks with the ability to add four more for additional versatility.
  • Comfort and Control – The multi-color / touch screen Information Display is the operator's gateway to monitoring machine performance, a convenient way of modifying machine parameters to tailor performance to the current task and access the service information for initial troubleshooting.
  • Monitor, Manage, and Enhance Job Site Operations – Cat Product Link™ Elite is deeply integrated into your machine, helping you take the guesswork out of equipment management. Easy access to timely information like machine location, hours, fuel usage, idle time and event codes via the online VisionLink® user interface can help you effectively manage your fleet and lower operating cost.


High mechanical availability is one of your top concerns. The 18M3 helps reduce downtime and operating cost through improved serviceability, fuel economy and reduced maintenance. Major components are modular in design, so most can be removed and reinstalled without disturbing other components.
  • Use Less Fuel – Engine Economy (ECO) Mode improves fuel economy by reducing high idle engine speed while maintaining machine power. ECO Mode controls the high engine idle speed (capped at 1,900 rpm in working gears) to ensure the engine is performing as efficiently as possible with respect to fuel consumption. ECO Mode could provide significant fuel consumption savings especially in operations that are typically run at light to moderate loads, high idle and gear usage between 3R to 5F.
  • Engineered for Maximum Production and Service Life – The center shift section of the front frame is made of heavy duty steel casting which improves stress distribution to this high load area for enhanced durability. The rear frame structure is lengthened to provide easy service access to components in the engine enclosure as well as improve machine balance. Front axle steering cylinder has been designed to enhance durability and hydraulic hoses have been routed to improve reliability.
  • Standard Front Axle Guard – A front guard helps protect the front axle from rocks or other debris that could damage the axle or its components.
  • Standard Transmission Guard – The transmission guard provides a steel protection from ground debris.
  • Ease of Maintenance – The modular cooling package makes for simple removal and installation of components on the cooling system which reduces service time. Engine enclosure doors provide complete and easy access to the engine without the impediment of any enclosure post. Also, extended maintenance intervals reduce the number of touches and downtime.
  • Protecting Your Asset – Ok to Start and critically low fluid monitoring systems help prevent critical components from damage when low fluid levels are present. All information is available via the Information Display within the cab, and diagnostic codes are logged.


You consider the safety of your workers a top priority, and we're doing our best to help you meet your safety goals. Caterpillar considers the safety of everyone in, on or around Cat equipment when developing new products or enhancing safety features for existing products. The 18M3 has numerous safety features such as but not limited to:
  • Access to Tandem
  • Light Emitting Diode (LED) Enclosure Service Lights
  • Seat Belt Indication
  • Fire Suppression Ready System
  • Rearview Camera
  • Access Platform – optional
  • Service Access Platform – optional


Your local Cat dealer is committed to helping you succeed, by ensuring you have the right machine for the job, making parts available, and providing you with versatile work tools.



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